如图所示周期信号f(t)，其直流分量等于（ ）
A: 6
B: 4
C: 2
D: 0
A: 6
B: 4
C: 2
D: 0
举一反三
- 如图x4．35所示周期信号f(t)，其直流分量等于_________。 A: 0 B: 2 C: 4 D: 6
- 如图所示周期信号f(t)，其直流分量等于（ ）[img=362x73]17d602abdeaa13b.png[/img] A: 6 B: 4 C: 2 D: 0
- 已知<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/e6d73bcaf9ea43ad8cc6d0448ce5cb54.png" />，其逆Z变换（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/334d49becc544757b952699488a42728.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/4ac8ed87292446f8852ade2dbcaaff0b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/5f5aa1dfaebe47d788513626d79951af.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/0a7716a303934c79a9af73a051a1a98a.png" />
- 已知某信号的拉氏变换<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/ec06694fc49c4bf5a6ba0fd2e2da191e.png" />，则该信号的时间函数为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/a0dfe38fe649447eaaa5fc249a132257.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/2c337c663bbb4715bbbda2710aed8308.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/1f910feb02c34764a8351b1bef10280e.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/d2db9dcb8c7847698298ad42ed6e3f0d.png" />
- 序列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/e1790a2df1984f8da7b286621e37686d.png" />的长度为4，序列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/5bd332b1c2a443b6ad2642f7370c587d.png" />的长度为3，则它们线性卷积的长度和5点圆周卷积的长度分别是（ ）。 A: 7, 5 B: 5, 5 C: 6, 6 D: 6, 5